Answer:
(a) 
(b) 
Step-by-step explanation:
(a) Write and simplify an expression for the exact area of the sidewalk.
(b) Find the approximate area of the sidewalk. Use 3.14 to approximate .
(a) The sidewalk area is the difference in the area of outer circle and inner circle.
Use formula 
for the area of the circle:
The difference is
(b) Use approximation 
then
The length equals 42 inches because you take 36+36 because there are two widths and that equals 72. Then take 156-72 which equals 84. Take 84 divided by two because there are two lengths and you get 42 inches!
Answer: There are 43 white marbles.
Step-by-step explanation:
t = total number of marbles = 54
w = white marbles = 4b - 1
b = blue marbles
54 = b + (4b - 1)
b + 4b = 5b
54 = 5b - 1
+1
55 = 5b
/5
11 = b
There are 11 blue marbles.
4(11) - 1
44 - 1 = 43
43 + 11 = 54, therefore our solutions are correct.
Answer:
true g = 35
just plug 35 in for g 60-35=25
Step-by-step explanation:
